Get Users from a List Collector and display their emails in an Email body

Hi,

I'm developing a form that will send an email notification once approved. The form has a list collector* variable. The email notification will need to display all users selected on the list collector along with their email addresses. The email notification I'm setting is part of the catalog item workflow. 

Since the list collector stores all users in one variable, how do I go about getting all users selected emails and then display them on the body of the email notification?

If I need to write an email script, please help with providing some examples.

Thank you

* the list collector references the sys_user table